Got an EB22, love it. Apart from new grips and taking the bolt probe diameter to help gas flow doesn't seem to be a lot you can do to improve it (please someone prove me wrong..)
The 2240 seems to be something you can mod more succesfully and there have been some cracking models pictured in this section.
At £70 I might be tempted to invest in one, (Quick Eric slap me.....)
Russ
Air Arms S400 Classic - Hawke Airmax 3-9x40 AO MAP6, SMK QB78 DL - JSR 4x40 Mildot ill.El Gamo ASI sniper, BSA Airsporter MkVI. UBC#22 - Sheridan EB22, Gamo Compact:R77-4:Falcon, Walther PPK, CP88 shiney, SMK G10, Baikal 53M:MAK, Crosman 357